I have a kiln with a 6-50plug. The kiln is: Operating Voltage: 240V (208V and 3 phase available) Amperage: 40A Watts: 9600W

I read on a number of websites that I could build an extension to connect it to my Dryer outlet which has a 10-30r. The Dryer breaker is 50A. I know that 50A to 30A extensions are available at RV and Welding resources, but are expensive and have slightly different plugs or receptacles than what I need, so I am making my own. I have a 6-50r, connected to 25’ of 10/3 wire(black, white and green) at one end and a 10-30p at the other. The black and white wires are attached to the side blades on both ends and the green to the center ones. The Dryer wall outlet has black, red and white wiring.

When I plugged it in(not yet attached to kiln) it not only tripped the Dryer breaker, but the main breaker also. I took apart both ends and saw that the white and black wires on the 10-30p were attached opposite from the Dryer outlet. I switched them and plugged it in again. It tripped the Dryer breaker but not the main. Again nothing is connected to the kiln. It blows the breaker as soon as plugged in to dryer outlet.

What am I doing wrong? My wiring looks exactly like the diagrams online.

Also on the 6-50r the wires are held directly in place with 2 large copper screws and one silver one, with no plate in between the screws and wire.. Is this correct? T

Thank you. Bobby

Sounds like you have it connected properly, may need to do continuity tests on cord and plugs, to determine if there is a short.

Thank you. Checked for continuity. Still blowing fuse. I have a GB Instruments Multimeter. I set it to OHM Rx1 and put one lead to the plug and the other to the receptacle. Whites to whites check out. Same with blacks to blacks.

When I test the plug only- white to ground checks out. Nothing on black to ground. Same on receptacle end.

Where is my problem?

Thanks,

Bobby

Test between black and white, black to ground, and then white to ground, there should be zero ohms.

If you get continutiy between any I mention, that is the short.

Thank you again. Sorry but as you can tell I know nothing about this stuff. I have replaced outlets and things, without any problems, but this has me stumped and frustrated.

Tried plug first . White to black - needle does not move. Black to ground - needle does not move. White to ground - needle goes to zero ohms.

Same results on receptacle.

On plug to receptacle White to white - zero ohms. Black to black -zero ohms.

Should I just cut the wires back on both ends and rewire everything. Or is the black wire on the cord bad.

Does "White to ground - needle goes to zero ohms." mean the needle moved? If so, there is the short circuit.

THANK YOU! THANK YOU! One of the prongs on the receptacle had popped out. When I put it back, I had it in backwards and it was touching the ground housing.

Works great.